GB549186A - Improvement in radio measuring systems - Google Patents
Improvement in radio measuring systemsInfo
- Publication number
- GB549186A GB549186A GB13987/41A GB1398741A GB549186A GB 549186 A GB549186 A GB 549186A GB 13987/41 A GB13987/41 A GB 13987/41A GB 1398741 A GB1398741 A GB 1398741A GB 549186 A GB549186 A GB 549186A
- Authority
- GB
- United Kingdom
- Prior art keywords
- receiver
- oscillator
- discriminator
- transmitter
- attenuator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000012360 testing method Methods 0.000 abstract 4
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
549,186. Wireless receiving apparatus. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 30, 1941; No. 13987. Convention date, Oct. 31, 1940. [Class 40 (v)] In a measuring system using a receiver in collaboration with a reference oscillator, a discriminator is used to keep the frequencies of the oscillator and receiver in agreement. Fig. 1 shows an arrangement for measuring the field strength of a transmitter. The receiver comprises a loop antenna 5, radio-frequency amplifier 7, mixer 9, I.F. amplifier 13, calibrated attenuator 21 and discriminator 15 the output from which is metered at 29 and may be heard in telephones 31 to assist in identifying the transmitter under test. The output of a reference oscillator 23 is fed to a loop antenna 27 coupled to loop 5 and in order to synchronize the oscillator and receiver, a voltage from the discriminator 15 can be fed through switch 35 to a reactance valve 25 controlling the oscillator frequency. The discriminator voltage may also be fed through switch 33 to a reactance valve 17 controlling the frequency of the receiver oscillator 11. To make a test the receiver is tuned to the transmitter and the attenuator 21 is adjusted to give a convenient reading on 29. The oscillator 23 is switched on to give a much larger signal and the attenuator is adjusted to give the same meter reading. At this attenuator setting, the signal from the transmitter can be disregarded and from the available data, the transmitter strength can be calculated. Fig. 2 shows an arrangement for testing a receiver 39 by applying signals from an oscillator through a calibrated attenuator, the oscillator frequency being synchronized with the receiver by a voltage from the discriminator 37 fed through switch 49 to a reactance valve 41 controlling the oscillator frequency. A further modification is described (Fig. 3, not shown) for testing a receiver which is not provided with a discriminator. The oscillator is provided with a discriminator having leads for connection to the I.F. output of the receiver.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US549186XA | 1940-10-31 | 1940-10-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB549186A true GB549186A (en) | 1942-11-10 |
Family
ID=21994369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13987/41A Expired GB549186A (en) | 1940-10-31 | 1941-10-30 | Improvement in radio measuring systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB549186A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2498676A (en) * | 1945-04-09 | 1950-02-28 | Standard Telephones Cables Ltd | Calibration apparatus for radio receiver |
DE3118059A1 (en) * | 1981-05-07 | 1982-11-25 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Method for determining the radiation lobe width of an antenna |
-
1941
- 1941-10-30 GB GB13987/41A patent/GB549186A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2498676A (en) * | 1945-04-09 | 1950-02-28 | Standard Telephones Cables Ltd | Calibration apparatus for radio receiver |
DE3118059A1 (en) * | 1981-05-07 | 1982-11-25 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Method for determining the radiation lobe width of an antenna |
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